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35
30
25
20
15
10
5
0
100
200
300
400
30
25
20
15
10
5
0
100
200
300
400
(A)
(B)
(C)
Fuel G31 - Holes 1.5 mm
500
600
700
800
Burnt output [kW]
Fuel G20 - Holes 2.0 mm
500
600
700
800
Burnt output [kW]
S9188
PILOT BURNER
Adjust the gas pressure measured when exiting
the valve VP 23)(A)p.4 for a value between:
Fuel
G20 - G25
G31
It is advisable to select an output that will ensure
the best possible pilot flame stability.
Check the single pilot flame stability and meas-
ure the ionisation current.
Make sure the value is 20 µA.
900
1000
1100
For the first ignition proceed without purging in
the main piping system and then check combus-
tion stability in presence of air in the main piping
S9189
system.
OPERATION CHARACTERISTIC
See diagram (A). It is valid for natural gas oper-
ation (G20) and pressure in the combustion
chamber = 0 mbar or with LPG (G31).
• With G25 operation, the gas pressure values
of the diagram for G20 need to be multiplied
by 1.3.
FIXING THE PURGING STRUCTURE TO THE
HEAD ASSEMBLY (B)
Fix the flange 1) to the plate 3) interposing the
insulating gasket 2) supplied.
Fix the assembly using the four M8 screws sup-
plied.
900
1000
1100
The seal between purging structure and head
assembly seal must be airtight.
EXAMPLES OF ASSEMBLY (C)
The fan structure can be rotated by 90º.
It is necessary to select a solution in which the
fan motor is in horizontal position and the pilot
valve coil in vertical position, pointing upwards.
NOTE: make sure you leave a clearance of at
least 2000 mm between the front of the combus-
tion chamber and the first obstacle facing it from
the front. In addition, a clearance of at least
300 mm at the sides of the chamber is recom-
mended.
Give the bottom of the combustion head a clear-
ance of 1000 mm from the chamber that houses
the air fan so as to avoid uneven flows of input air
and ignition problems.
WARNING
20077303
11
These data are referred to the codes
of the head assembly (B)
mbar
kW
7 ÷ 15
9 ÷ 20
3 ÷ 6
9 ÷ 20
Do not install the burner near piping
curves or obstacles: apart from
causing overheating problems, this
increases the CO generated.
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